"You really want search-before-you-type – that is, you want results for the most likely search given what you have already typed."

Cache rules everything around me

In the blog post, Mayer explains the technology behind Instant Search, noting: "To bring Google Instant to life, we needed a host of new technologies including new caching systems, the ability to adaptively control the rate at which we show results pages and an optimisation of page-rendering JavaScript to help web browsers keep up with the rest of the system.

"In the end, we needed to produce a system that was able to scale while searching as fast as people can type and think – all while maintaining the relevance and simplicity people expect from Google."

On Twitter, Google CEO Eric Schmidt was so excited about the launch he hinted before the release: "We are already fast... fast is about to get faster."

Not everyone will see Google Instant straight away as this is a rolling launch. However, if you are in the France, Germany, Italy, Russia, Spain and the UK and sign into Google you should have it.

Google does not say whether it will become the core search engine experience for Chrome, Firefox, Safari and IE 8.

Or you could watch the video below, which shows off Google Instant in a Bob Dylan styled mashup. Not sure whay Dylan makes of this new technology but there you go - it's not exactly sticking it to the man.